"Ren Hijikata is a main character in the Japanese manga series, ""Abandoned Universe."" He is a powerful and skilled pilot who flies the giant robot known as the ""Assaulter.""

Ren's background is shrouded in mystery, but it is revealed that he was once a soldier and a member of the Special Forces. He left the military under unknown circumstances and began working as a freelancer, taking on jobs that involve combat and using his piloting skills to make a living.

Despite his tough exterior, Ren is known for his unwavering sense of justice and his willingness to protect those in need. He has a strong sense of responsibility and will stop at nothing to ensure the safety of those around him.

Ren's combat skills are second to none, and his abilities as a pilot are unmatched. He is able to handle even the most difficult situations with ease and is always ready for a fight.

Throughout the series, Ren becomes embroiled in a number of conflicts with various factions vying for power. He eventually forms a close bond with the other main characters as they work together to protect their world from those who seek to exploit it.

Despite his harsh exterior, Ren is a complex and interesting character with a strong moral compass and a deep sense of loyalty to his friends and allies. His skills as a pilot and combatant make him a formidable force to be reckoned with, and his dedication to protecting others make him a true hero."